JH
Available for Remote/Part-timeGMT+7 (Jakarta)

Jatmiko Herjati

(to be) The Best Geospatial Software Engineer

Software Engineer with 8+ years of experience delivering high-impact projects for tech companies and government clients. Specializing in Fullstack Development (React, Next.js, FastAPI), Mobile Development (React Native), and Geospatial Applications (Mapbox, PostGIS, CesiumJS).

8+
Years Experience
CTO
Braga Technologies
M.Eng
Informatics (ITB)
4
Featured Projects

Measurable Impact

📊
25%

Network Throughput

Enhancement through third-party system integration

35%

Web Vitals Score

Performance improvements in production applications

🚀
50%

Time to Market

Reduction in delivery time and production costs

⚙️
60%

Deployment Friction

Reduced through CI/CD pipeline implementation

Starting as a


Geomatics Engineer

At the outset of my journey in Geomatics, I wasn't just absorbing the foundational knowledge of geospatial science, but also cultivating a passion for technical solutions. From this point, my journey as a software engineer commenced.

Wave background

From Data Visualization to


Frontend Engineering

Data visualization isn't confined to just maps. As I delved into Frontend Engineering, I realized that data could "speak" in numerous forms – tables, charts, lists, cards, and more. I mastered the art of presenting data in the most effective and captivating ways.

From Data Management to


Backend Engineering

A stellar spatial solution requires a robust data foundation. From the backend, I built, optimized, and integrated systems to ensure data is delivered swiftly and accurately. From spatial operations to crafting responsive APIs, I'm the architect behind the visuals you witness.

Finally becoming a

Spatial

Software Engineer

With the knowledge I garnered from Geomatics to Computer Science, I've bridged these two worlds. I'm not just any software engineer; I am a spatial software engineer. This unique expertise empowers me to offer integrated and holistic solutions for your geospatial needs.

Featured Projects

Browser-first geospatial tools built with modern web technologies

Geomatcher preview

Geomatcher

Dec 2025 - Present

Built GeoMatcher, is a privacy‑first, browser‑only geospatial data matching tool that cleans and joins messy CSV/Excel location columns to administrative boundaries. It uses DuckDB WASM for in‑browser analytics, a three‑tier matching engine (exact, semantic, fuzzy), spatial point‑in‑polygon, and exports crosswalks to CSV/Excel/GeoJSON—no server required.

DuckDBFuzzy MatchingNLPData Engineering
Geoverse preview

Geoverse

Nov 2025 - Present

Built a free, lightweight, browser-only WebGIS alternative to QGIS. Geoverse combines DuckDB WASM spatial SQL, MapLibre GL mapping, and a React/TypeScript UI for dataset management, table views, spatial operations, and multi-format export.

React.jsTypeScriptDuckDBMapboxData VisualizationSQL
Geoconverter preview

Geoconverter

Oct 2025 - Present

Built GeoConverter, a browser‑based geospatial file converter that runs GDAL/OGR in WebAssembly for fully local, privacy‑first processing. Supports 30+ vector formats, CRS reprojection, geometry/attribute filtering, simplification, and format‑specific optimizations, delivered through a modern React + Vite UI.

WebAssemblyGDALReact.jsTailwind CSSUser Interface Design
Lite Semantic Search preview

Lite Semantic Search

Sep 2025 - Oct 2025

Built a lightweight, browser-based semantic search app that runs fully client‑side using PGlite (PostgreSQL WASM) and Transformers.js. It ingests PDFs/Markdown/text, chunks and embeds content in‑browser, and combines semantic + keyword search with dual highlighting. All data stays local in IndexedDB, with fast HNSW vector search and no server required.

PostgreSQLSemantic SearchTransformers.jsVector Search

Enjoying These Tools?

All my projects are free and open-source. If you find them useful, consider supporting their development and maintenance. Your support helps me dedicate more time to building innovative geospatial tools for the community.

Support on Ko-fi

Trusted by Leading Organizations

Delivering high-impact geospatial solutions for international companies and government agencies

Pozibl

International

Salient

International

HERE Technologies

International

Hyundai Motor Company

International

BNPB

Government

Ministry of PUPR

Government

Ministry of Agrarian Affairs (ATR/BPN)

Government

BIG (Geospatial Information Agency)

Government

BRIN (National Research & Innovation)

Government

GIZ Indonesia & ASEAN

Government

Braga Technologies

Tech Company

Telkom Indonesia

Tech Company

Propspotter

Tech Company

Multi-Hazard Early Warning System

Led full-stack development for BNPB's disaster response platform with real-time geospatial analytics

City Information Model (CIM)

Built 3D GIS platform for urban planning using 3D Tiles and Xeokit for Ministry of PUPR

BHUMI Land Management

Revolutionary web application for land management and administration with ATR/BPN

Skills & Expertise

Full-stack development with specialized geospatial capabilities

Backend

FastAPINode.jsPythonDockerKubernetesREST APIsGraphQLMicroservices

Frontend

React.jsNext.jsTypeScriptTailwind CSSReact NativeViteRedux

Geospatial

Mapbox GL JSMapLibre GLPostGISCesiumJSGDAL/OGR3D TilesXeokitSpatial SQL

Database & Data

PostgreSQLPostGISDuckDBRedisMongoDBVector SearchIndexedDB

Cloud & DevOps

AWSGitHub ActionsCI/CDPrometheusGrafanaOpenTelemetryDirectus CMS

Emerging Tech

WebAssemblyTransformers.jsSemantic SearchMachine LearningDuckDB WASMPGlite

Education & Achievements

Education

Master of Engineering

Informatics Engineering

Institut Teknologi Bandung (ITB)

2021 - 2023

Bachelor of Science

Geodesy and Geomatics Engineering

Institut Teknologi Bandung (ITB)

2013 - 2017

Awards & Certifications

Bhumandala Award 2023

2023

Recognition for excellence in geospatial engineering

Certifications

  • Advanced React For Enterprise: React for senior engineers
  • The Comprehensive Android App Development Masterclass
  • NodeJS - The Complete Guide (MVC, REST APIs, GraphQL, Deno)
  • Android Jetpack Compose: The Comprehensive Bootcamp
  • Machine Learning with Javascript